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+//Chapter-11 example 54
+//=============================================================================
+clc;
+clear;
+//input data
+f       = 10*10^9;      // operating freq. of radar in Hz
+Vo      = 3*10^8;       //vel of Em wave in m/s;
+D       = 5;            //Diameter of antenna in m
+
+//calculations
+lamda   = Vo/f;         // wavelength in m
+BW      = 70*(lamda/D)  // BeamWidth in degrees
+
+//output
+mprintf('Beamwidth  = %3.3f degrees',BW);
+//==============================================================================